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Trying to run Apache Directory Studio on Catalina (v10.15.6) generates the error:
"Apache Directory Studio" can't be opened because Apple cannot check it for malicious software.
This software needs to be updated. Contact the developer for more information.
Perhaps this: https://developer.apple.com/documentation/xcode/notarizing_macos_software_before_distribution
Apache Studio can not be run on MacOS 11.2 (Big Sur)